Die-stock holding and operating device.



PATENTED FEB. 26, 1907.

No. 845,514. v

- w. v. BULMAN.

DIE STOCK HOLDING AND OPERATING DEVIGEr APPLICATION FILED 00'1.30, 1906.

WILLIAM V. BULMAN, OF PHILADELPHIA, PENNSYLVANIA.

DIE-STOCK HOLDING AND OPERATING DEVICE.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed October 30, 1906. Serial No. 341.222.

To all whom it may concern:

Be it known that I, WILLIAM V. BULMAN, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have in vented certain new and useiul Improvements in Die-Stock Holding and Operating Devices; and I hereby declare that the rollowing is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is a novel device for holding and operating pipe and bolt threading die-stocks.

It is particularly designed for use in connection with large-sized die-stocks; and its object is to enable such stocks to be readily manipulated by one man easily and with great power.

The invention consists in the novel construction of the holder and operating device as hereinafter claimed, and which I will describe, with reference to the accompanying drawings, which illustrate the at present preferred and best form of the device known to me.

In said drawings, Figure 1 is a front elevation of the die-stock holder, indicating diestock in position therein in dotted lines. Fig. 2 is a transverse section on line 2 2, Fig. 1. Fig. 3 is an enlarged detail section showing the ratchet-dog.

The device comprises an annular holder 1, whose internal diameter is slightly greater than the length of the largest die-stock to be operated thereby when the handles are detached from such stock, the length of the diestock being taken in the line of and between the extremities of the handle-sockets thereof. The outer surface of the annulus may be notched or ratcheted, as indicated in the drawings, and it is provided on its inner face at diametrically opposite points with retainers 3 for a purpose hereinafter explained.

The die-stock D is indicated in dotted lines in Fig. 1 and may be of any desired construction, and nipples 2 are screwed into the handle-sockets D of the stock until the distance between the outer ends of the nipples is equal to the interior diameter of the holder 1. Then the nipples are engaged with the retainers 3, as indicated in the drawings, said retainers having studs 3 which enter the nipples 2, and are also provided with plates3", which are dovetailed on their edges and engage dovetailed grooves 1 at diametricallyopposite sides or the annulus, and said studplates are lemovably fastened to the annulus by screws 3.

W hen it is properly positioned, as shown in Fig. 1, the die-stock 1) W111 be lirmly secured in the holder and can be axially rotated by rotating the holder on its axis. The holder can be rotated by means 01' a lever 4, whlch has a socket portion 4*, to which an extension lever-handle 4 of any desired length can be attached. The lever e is pivoted upon a grooved collar 6, Whlcl1 is adapted to be slipped upon the neck D of the die-stock D and may be provided with a notch o" adapted to engage one or the ordinary ribs a ol the die-stock to prevent the collar rotating. The

collar, however, is provided with ears 6 at opposite sides, through which are passed setting-bolts 6, which engage the dlestock sleeve D and by these tne collar can be detachably secured and centered on the stock.

The inner end of lever 4 may be provided with a split yoke 4 the parts of which embrace collar 6 and can be screwed together by bolts 4 This lever 4 has a portion 4, which projects over and partly embraces the periphery of the holder, as shown, so as to prevent lateral displacement of the lever and holder. In this projection 4 is arranged a dog 5, pressed inward by a spring 5" and having a handle 5' on its outer end, by which the dog can when desired be retracted and held retracted by engaging the handle with a projection 4, as indicated in llig. 8 in dotted lines, or the dog can be turned half-way around, so as to reverse the movement of the annulus, if desired. The dog 5 is adapted to engage the series of notches 1 in the holder 1, which notches practically form a ratchetsurface on the periphery of the holder.

It will be seen from the drawings that when the lever 4 is oscillated the holder 1 will Le rotated and impart rotary movement to the die-stock, so as to cut the thread. By detaching studs 3 and loosening plates 6 the die-stock can be quickly removed from the holder and another die-stock of different size or kind can be easily sut stituted therefor. The device is useful with various sizes and forms and kinds of die-stock and cutters.

It will be seen that the holder is adapted to operate with a large variety of kinds and sizes of die-stocks; that the nipples 2 and studs 3 provide an easy and facile mode of connecting and disconnecting the stocks from the holder; that the lever 4 has apivotal support or fulcrum upon the stock near the Work, While it engages the holder at a point relatively remote from the stock, and thus the Workman has ample leverage upon the stock to manipulate it. The collar 6 is attachable to various sizes of stocks by reason of the bolts. The device can be operated right or left, and the handle-lever can be operated from any side of the holder, thus enabling the stock to be used in corners and close to Walls and to be easily manipulated in many positions Where it Would be almost impractical or very difficult to operate it in the ordinary manner. Obviously also the holder can be used for operating pipe-cutting stocks and internal or external threadingstocks and pipe or bolt threading die-stocks.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. The combination of an annular holder, a die-stock, and means in the holder for detachably engaging the handles of the diestock to secure the latter in the holder, a lever for operating the holder, means for pivotally mounting the lever upon the die-stock,

tached to the holder, and nipples adapted to engage the handle-sockets of a die-stock and said studs to secure the die-stock in the holder.

4. The combination with a holder, means for detachably attaching a die-stock to said holder, a grooved collar adapted to be detachably attached to the die-stock, a lever pivotally mounted on said collar, means for detachably fastening the collar to the diestock, and a dog on the lever adapted to engage a ratchet-surface on the holder.

in testimony that I claim the foregoing as my own I affiX my signature in presence of tWo Witnesses.

l/VILLIAM V. BULMAN. l/Vitnesses ARTHUR E. DoWELL, L. E. VVITHAM. 

